Grandstream Networks UCM6100 Series User Manual page 301

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Listen
In "Listen" mode, the extension monitoring the call can hear both parties in the active call but the audio
of the user on this extension will not be heard by either party in the monitored active call.
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Whisper
In "Whisper" mode, the extension monitoring the call can hear both parties in the active call. The user
on this extension can only talk to the selected monitored extension and he/she will not be heard by the
other party in the active call. This can be usually used to supervise calls.
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Barge
In "Barge" mode, the extension monitoring the call can talk to both parties in the active call. The call will
be established similar to three-way conference.
4. Enable or disable "Require Confirmation" option. If enabled, the confirmation of the invited monitor's
extension is required before the active call can be monitored. This option can be used to avoid adding
participant who has auto-answer configured or call forwarded to voicemail.
5. Click on "Add". An INVITE will be sent to the monitor's extension. The monitor can answer the call and start
monitoring. If "Require Confirmation" is enabled, the user will be asked to confirm to monitor the call.
Another way to monitor active calls is to dial the corresponding feature codes from an extension. Please refer to
[Table 87: UCM6100 Feature Codes]
and Call Recording section for instructions.
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UCM6100 Series User Manual
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